170results about How to "Reduce the rate of hydrolysis" patented technology

The invention belongs to the field of advanced nano-sized porous materials and techniques, in particular relates to an ordered mesoporous metal oxide material with ultra-large aperture and a preparation method thereof. According to the invention, a block copolymer with ultrahigh-molecular-weight hydrophobic segments is used as a template agent for the mesoporous material, and based on the principle of ligand-assisted self-assembly, the microphase separation of the ultrahigh-molecular-weight hydrophobic segments from hydrophilic phases occurs during the solvent evaporation process, to form an ordered mesoscopic structure. A variety of materials are used for synthesizing the mesoporous material, such as titanium dioxide, aluminum oxide and zinc oxide. The synthesized mesoporous material retains the order of mesopores and has an extremely large aperture not less than 20 nm. The invention provides an effective and convenient method for synthesizing ultra-large aperture mesoporous materials. The material and the synthesis method of the material have wide application prospect in various fields. The method is simple, has easily-available raw materials, and is suitable for large-scale production.

The invention discloses a special rice fertilizer with both soil improvement and fertilizer efficiency functions for coastal saline soil and a preparation method and application of the special rice fertilizer. The special rice fertilizer comprises the following components in parts by mass: 35-40 parts of humic acid, 15-20 parts of fulvic acid, 20-25 parts of a composite fertilizer, 15-20 parts of a silicon calcium fertilizer, 1-1.5 parts of a urease inhibitor and 1-1.5 parts of a nitrification inhibitor. According to the invention, the application method combines soil culture, root system activation, crop nourishment and fertilizer efficiency improvement, so the rice fertilizer is low in cost, stable in effect, applicable to mechanical operation, not only applicable to coastal intertidal zones, but also applicable to rice planting in saline-alkali soil in north China or even northwest inland.

A process for in-situ preparing UV-resistant polyester by use of TiO2 nanoparticles includes such steps as synthesizing the hydrolysis speed controllable glycol salt of Ti, organic stabilizing it, dispersing it in diol, and polymerizing (or copolymerizing) with polyester and other monomers. Its advantage is high UV shielding effect.

The invention discloses an air purifying photocatalyst. Anatase type titanium dioxide acts as a base body of the catalyst, and sulfur and lanthanum act as doped components, wherein the mole ratio of sulfur to lanthanum to titanium dioxide is (0.1-2) to (0.001-0.015) to 1, and the catalyst exists in a form of powder. The preparation process of the catalyst comprises the following steps of feeding the titanium source, the sulfur source and the lanthanum source according to a certain ratio, adding a dispersing agent and an inhibitor, hydrolyzing at the temperature of 10-80 DEG C with the pH of 2-7 so as to generate gel, drying at constant temperature in a drying oven, putting into a muffle furnace, firing and the like. The prepared anatase type sulfur and lanthanum codoped nano titanium dioxide powder is uniform in particle size, is controllable in particle size, is good in dispersibility, has a good catalytic degradation and purification effect on harmful gases, such as formaldehyde in an air environment, and meanwhile has a good antibacterial property.

The invention discloses a preparation method for plant oil-based polyurethane coated fertilizer having improved water resistance. The preparation method comprises the following steps that step 1, modification treatment is performed on plant oil polyalcohol, wherein by weight, 0.2%-5% of hydrolysis stabilizer is added into the plant oil polyalcohol and stirred at high temperature, so that modified plant oil polyalcohol is obtained; step 2, The polyurethane coated urea slow-release fertilizer is prepared, wherein large-particle urea is taken by weighing, the temperature is raised to 78-80 DEG C and is maintained, the modified plant oil polyalcohol prepared in the step 1 and lubricant are fully mixed and fused through a coating method, afterwards, the mixture and liquid isocyanate resin are quickly mixed, the surfaces of urea particles are evenly coated with the mixture, the urea particles and the coating liquid are fully mixed in a revolving drum, the coating liquid is gradually subjected to crosslinking solidification, and finally the polyurethane coated urea slow-release fertilizer is formed. Water resistance testing is performed on the prepared plant oil-based polyurethane coated urea, and a good result is obtained.

The invention discloses an ultrafine coated cadmium selenide sulfide ceramic pigment preparation method, which comprises: (1) dissolving a cadmium salt and a surfactant into water to obtain a solutionA, dissolving sodium sulfide and selenium into water to obtain an alkaline solution, adding the solution A into the alkaline solution in a dropwise manner to obtain a cadmium selenide sulfide precursor, and carrying out a hydrothermal reaction to obtain dispersed cadmium selenide sulfide; 2) adding a water glass solution into an acid solution, and controlling the pH value to obtain a silicic acidsolution; 3) adding the dispersed cadmium selenide sulfide into a zirconium oxychloride dispersion liquid, adding the silicic acid solution, adjusting the concentrations of the silicon ions and the zirconium ions, adjusting the pH value, and heating to obtain a gel; and 4) drying the gel, uniformly mixing the dried gel and a mineralizing agent, and calcining to obtain the ultrafine coated cadmiumselenide sulfide ceramic pigment. According to the invention, the particle size D100 of the pigment prepared by the method is less than 1.3 [mu]m, and the method has good condition controllability and good reproducibility, and is suitable for large-scale production.

The invention relates to a compound nitrogen fertilizer which is granular and is made from the following raw materials: calculated on the basis of total weight of raw materials of the compound nitrogen fertilizer, 30-40% of urea, 50-58% of ammonium chloride, 2.5-3.0% of diluted sulfuric acid and 0.8- 1.0% of synthetic ammonia. The inventive compound nitrogen fertilizer can efficiently increase the utilization rate of nitrogen element, prolong the period of fertilizer effect, increase crop yield, reduce the agricultural pollution of nitrogen fertilizer, and protect the environment.

The invention relates to a preparation method of a low temperature liquid phase precipitation process bismuth oxyiodide visible light photocatalyst. Organic acid assisted regulation and low temperature liquid phase precipitation process are employed to prepare the bismuth oxyiodide photocatalyst, the coordinating complexation of organic acid and bismuth ions is utilized to reduce the hydrolysis rate of bismuth ions and regulate the growth rate, structure and morphology of bismuth oxyiodide crystal nucleus, and white light LED is adopted as the simulated visible light source for photocatalyticdegradation of the dye solution. The preparation method of the bismuth oxyiodide photocatalyst provided by the invention has the characteristics of simple and feasible operation, no need for adding ofmacromolecule or surfactant, reaction under low temperature or room temperature condition, low energy consumption and short reaction time. After 80-100min irradiation by white light LED, the photocatalytic degradation of the bismuth oxyiodide photocatalyst on a dye solution almost achieves equilibrium, and after 100min irradiation by white light LED, the photocatalytic dye degradation efficiencyof the bismuth oxyiodide photocatalyst on 10mg / L and 50mg / L dye solutions respectively reach 75-96% and 35-46%, and after five cycles of utilization, the photocatalytic dye degradation rate of the bismuth oxyiodide photocatalyst is 70-85% of the first photocatalytic dye degradation rate, therefore the bismuth oxyiodide photocatalyst can be widely applied in visible light photocatalytic degradation, dye wastewater pollution treatment and other fields.

The invention discloses a method for preparing bendamustine hydrochloride freeze-dried preparation. In the method, the bendamustine hydrochloride is dissolved in medicinal ethanol first and then mixed with water-containing solution, and the mixture is stored at low temperature, so long-time contact between the bendamustine hydrochloride and water is prevented, and the hydrolyzation speed of the bendamustine hydrochloride is reduced because of the low-temperature storage. Moreover, for improving the situation that stable freeze-dried preparation with high re-dissolubility and beautiful appearance cannot be obtained by using organic solvent ethanol in the prior art, the inventor, through deep study, finds that the stable freeze-dried preparation with high re-dissolubility and beautiful appearance can be realized by using the safe medicinal ethanol. The bendamustine hydrochloride freeze-dried preparation prepared by the method has the advantages of low impurity content, low organic solvent residue content, high stability, beautiful appearance, high re-dissolubility and applicability to clinical application and industrial production.

The invention relates to a preparation method for a hollow titanium dioxide / polyacrylate composite film with an insulation performance. A template method for preparing hollow titanium dioxide needs to be finished by two steps, and the process is complex. The preparation method disclosed by the invention comprises the following steps: dispersing polystyrene microspheres in absolute ethyl alcohol and ultrasonically treating to form mixed solution A; adding butyl titanate in absolute ethyl alcohol to form mixed solution B; dripping the mixed solution B and ammonia water into the mixed solution A; heating and stirring in a water bath to obtain a white turbid liquid, carrying out a centrifugal treatment, washing and drying to obtain hollow titanium dioxide particles, ultrasonically dispersing the hollow titanium dioxide particles in distilled water, and mixing and stirring with a polyacrylate emulsion to obtain a composite emulsion; then taking the composite emulsion in a polytetrafluoroethylene plate and carrying out film formation to obtain the hollow titanium dioxide / polyacrylate composite film. The preparation method disclosed by the invention realizes one-step synthesis for hollow titanium dioxide with a regular structure, and overcomes the defect of a complex process; moreover, the hydrolysis speed of butyl titanate is reduced through the ammonia water, the uniform coating of titanium dioxide is realized, and hollow titanium dioxide with the regular structure is formed.